The NuTone C907 Transformer has the ability to power up to 3 door chimes in one home. The C907 is a 16 volt, 30VA transformer that features a thermal cut-off switch that is designed to shut off the door chime system in the event of excessive temperature. Another great feature is a lock-mount or wall-mount for quick installation and constructed to be long lasting.
The C907 transformer can be used for the discontinued IM3003 and IM3303 systems.